nes-proj/platform/netsim/net/tapdev.c

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/*
* Copyright (c) 2001, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Author: Adam Dunkels <adam@sics.se>
*
* $Id: tapdev.c,v 1.1 2006/06/17 22:41:36 adamdunkels Exp $
*/
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <sys/socket.h>
#ifdef linux
#include <sys/ioctl.h>
#include <linux/if.h>
#include <linux/if_tun.h>
#define DEVTAP "/dev/net/tun"
#else /* linux */
#define DEVTAP "/dev/tap0"
#endif /* linux */
#include "net/uip.h"
#include "net/uip_arp.h"
#include "net/uip-fw.h"
#include "net/tapdev.h"
#include "net/tcpip.h"
#define DROP 0
static int drop = 0;
static int fd;
static unsigned long lasttime;
static struct timezone tz;
#define BUF ((struct uip_eth_hdr *)&uip_buf[0])
static void do_send(void);
u16_t
tapdev_poll(void)
{
fd_set fdset;
struct timeval tv;
int ret;
tv.tv_sec = 0;
tv.tv_usec = 0;
FD_ZERO(&fdset);
if(fd > 0) {
FD_SET(fd, &fdset);
}
ret = select(fd + 1, &fdset, NULL, NULL, &tv);
if(ret == 0) {
return 0;
}
ret = read(fd, uip_buf, UIP_BUFSIZE);
if(ret == -1) {
perror("tapdev_poll: read");
}
return ret;
}
/*---------------------------------------------------------------------------*/
void
tapdev_init(void)
{
char buf[1024];
fd = open(DEVTAP, O_RDWR);
if(fd == -1) {
perror("tapdev: tapdev_init: open");
return;
}
#ifdef linux
{
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP|IFF_NO_PI;
if (ioctl(fd, TUNSETIFF, (void *) &ifr) < 0) {
perror(buf);
exit(1);
}
}
#endif /* Linux */
snprintf(buf, sizeof(buf), "ifconfig tap0 inet 192.168.2.1");
system(buf);
printf("%s\n", buf);
lasttime = 0;
/* gdk_input_add(fd, GDK_INPUT_READ,
read_callback, NULL);*/
}
/*---------------------------------------------------------------------------*/
static void
do_send(void)
{
int ret;
char tmpbuf[UIP_BUFSIZE];
int i;
if(fd <= 0) {
return;
}
/* printf("tapdev_send: sending %d bytes\n", size);*/
/* check_checksum(uip_buf, size);*/
#if DROP
drop++;
if(drop % 8 == 7) {
printf("Dropped an output packet!\n");
return;
}
#endif /* DROP */
for(i = 0; i < 40 + UIP_LLH_LEN; i++) {
tmpbuf[i] = uip_buf[i];
}
for(; i < uip_len; i++) {
tmpbuf[i] = ((char *)uip_appdata)[i - 40 - UIP_LLH_LEN];
}
ret = write(fd, tmpbuf, uip_len);
if(ret == -1) {
perror("tap_dev: tapdev_send: writev");
exit(1);
}
}
/*---------------------------------------------------------------------------*/
u8_t
tapdev_send(void)
{
uip_arp_out();
do_send();
uip_len -= UIP_LLH_LEN;
return UIP_FW_OK;
}
/*---------------------------------------------------------------------------*/
void
tapdev_send_raw(void)
{
do_send();
}
/*---------------------------------------------------------------------------*/